The trackball on a Blackberry is very handy for navigating your device and the web, but occasionally you’ll find that your trackball might stop moving in a particular direction. It’s recommended that you attempt to troubleshoot this issue by continuously rolling your trackball. In such a cases, the culprit is often a small particle that is lodged within the trackball’s mechanism and can easily be dislodged by a continuous roll. However, when this doesn’t work, there are other troubleshooting options.
Before we go any further, it’s important to note that the following troubleshooting options are not recommended by RIM or your provider and could render your Blackberry’s warranty useless if any damage occurs while employing one of these methods. Remember to regularly backup your Blackberry, especially before performing one of the following troubleshooting operations.
That said, many users (including myself) have solved a paralyzed trackball by simply placing a drop or two of rubbing alcohol directly on the trackball and rolling the trackball around as the alcohol dries.
Other users have reported that taking a vacuum hose or liquid air to the Blackberry trackball has helped to suck out or blow out whatever is obstructing its free movement.
Lastly (and probably the most risky troubleshooting technique), others have actually removed their trackballs, cleaned them and replaced them when none of the above options haven’t worked. A Google search for “clean Blackberry trackball" will yield several sites where users share step by step instructions for doing so. It cannot be stressed enough, however, that these options are not recommended by RIM and could cause damage to your phone. Only if you feel confident in taking this risk, should you proceed in trying to troubleshoot and repair your trackball issues in this way.